锂离子电池电解液除酸除水添加剂的研究进展

Research Progress of Additives for Acid and Water Removal in Electrolyte of Lithium Ion Battery

商用锂离子电池电解液在应用过程中存在电解质锂盐六氟磷酸锂(LiPF;)易在痕量水环境中发生水解反应,进而导致锂离子电池体系的综合电化学性能受损。因此,亟需控制电解液本体中痕量水的引入以及减小锂盐与痕量水反应产物对电池体系影响的措施。本文主要综述了含有不同官能团的添加剂在除去电解液中痕量水和酸时所具有的特性,并重点分析介绍了其除酸除水的作用机理。最后,对除酸、除水型添加剂未来的研究方向和应用前景进行了展望。

In the application process of commercial lithium-ion battery electrolyte,the electrolyte,lithium salt lithium hexafluorophosphate(LiPF;),is prone to hydrolysis in presence of trace water,which can lead to the comprehensive electrochemical performance damage of the battery system. Therefore,it is urgent to control the introduction of trace water in the electrolyte body and measures to reduce the influence of lithium salt and trace water reaction products on the battery system. This article mainly summarizes the characteristics of additives containing different function groups in removing trace amounts of water and acid from electrolytes,and analyzes the function of acid-removing and water-removing. Finally,future research directions as well as application prospects of acid-removing and water-removing additives are prospected.